I have an LX and XT mix drivetrain on my 04 Blade with the long travel links. The shifting is not so good. I want to go to a two chainring with bash guard crank. Any suggestions on which crank to get? The rest of the drivetrain is worn out, so I'll be replacing everything. I want to keep my 22x34 granny gear. Will a short cage deraileur work OK? Which brand is preferred on a Blade? Shimano or SRAM? Thanks!